<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="articles.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{articles.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" src="https://img.yzcdn.cn/vant/cat.jpeg" />
          <div slot="title" class="user-name">{{articles.aut_name}}</div>
          <div slot="label" class="publish-date">{{articles.pubdate | formatData}}</div>
          <!-- <UserFollowed @updataFollowed="articles.is_followed = $event" :isFollowed="articles.is_followed" :autId="articles.aut_id" /> -->
          <UserFollowed v-model="articles.is_followed" :autId="articles.aut_id" />
          <!-- v-model 如何解析 -->
          <!--
            解析两个
            1个属性：:value="articles.is_followed"
            1个事件： @input='$event'
           -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" v-html="articles.content" ref="content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <ArticleComment @updataTotal="totalCount = $event" :source='articles.art_id' />
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleInfo()">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 底部区域 -->
    <div v-if="articles.title" class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small">写评论</van-button>
      <van-icon name="comment-o" :badge="totalCount" color="#777" />
      <ArticleCollected :artId="articles.art_id" v-model="articles.is_collected" />
      <van-icon color="#777" name="good-job-o" />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
  </div>
</template>

<script>
import { getArticleInfo } from '@/api/article.js'
import { ImagePreview } from 'vant'
import UserFollowed from '@/components/sg-ui/user-followed.vue'
import ArticleCollected from './components/article-collected.vue'
import ArticleComment from './components/article-comment.vue'
export default {
  name: 'articleInfo',
  data () {
    return {
      articles: {},
      isLoading: false,
      is404: false,
      isFollowLoading: false,
      totalCount: 0
    }
  },
  props: {
    articleId: {
      type: String
    }
  },
  methods: {
    // 获取文章详情
    async loadArticleInfo () {
      this.isLoading = true
      try {
        const res = await getArticleInfo(this.articleId)
        this.articles = res.data.data
        console.log(this.articles)
        this.isLoading = false
        // 数据驱动是异步的，数据变是同步的
        this.$nextTick(() => {
          this.previewImg()
        })
      } catch (err) {
        this.$toast('获取文章详情失败')
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
      }
      this.isLoading = false
    },
    previewImg () {
      // 图片预览
      const imgs = this.$refs.content.querySelectorAll('img')
      console.log(imgs)
      const images = []
      imgs.forEach((item, index) => {
        images.push(item.src)
        // console.log(images)
        item.onclick = function () {
          ImagePreview({
            images,
            startPosition: index
          })
        }
      })
    }
  },
  computed: {},
  watch: {},
  filters: {},
  components: {
    UserFollowed,
    ArticleCollected,
    ArticleComment
  },
  created () {
    // console.log(this.$route.params.articleId)
    this.loadArticleInfo()
  },
  mounted () { }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
